mystix commented on issue #1566: BeaconUrl uses HTTP instead of HTTPS + LoadFromFile not working URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1566#issuecomment-463229592 > Apache: ModPagespeedAddResourceHeader "Content-Security-Policy" "upgrade-insecure-requests;" Nginx: pagespeed AddResourceHeader "Content-Security-Policy" "upgrade-insecure-requests;" > Might help you force browser only request resourse on HTTPS This helped resolve the mixed content warning issue for me on nginx 1.15.6 (Debian Stretch). NOTE: the mixed content warning doesn't appear when running ngx_pagespeed in standby mode: ```pagespeed standby;``` and requesting the URL with the ```?PageSpeed=on``` query parameter i.e. ```https://example.com?PageSpeed=on```
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